US1596086A - Process and apparatus for spinning artificial silk - Google Patents

Description

Aug. 17, 1926. I 1,596,086

E.ELSAES$ER FAL PROCESS AND APPARATUS FOR SPINNING ARTIFICIAL SILK Filed Oct. 9, 1924 Graven for- F 35562268 e/i' Patented Aug. 17, 1926.

UNITED STATES EMIL ELSAESSER AND, AUGUST HARTMANN, 0F BARMEN-LANGEBEELD, GERMANY, ASSIGNORS, BY MESNE ASSIGNMENTS, T0 AMERICAN BEMBERG CORIORATION, A

CORPORATION OF DELAWARE.

PROCESS AND APPARATUS FOR SPINNING ARTIFICIAL SILK,

Application filed October 9, 1924, Serial No.

In German patent specification No. 220,051

a process and apparatus is described for the spinning of artificial silk, in which the fibres, after leaving the spinning nozzle, are surrounded at first by a slowly flowing pre-- cipitating liquid, and not T untilafter they are partly drawn out therein and are also part y hardened and have thus become more resistant, are they seized by a strong current of liquid and carried farther. For this purpose apparatus is indicated which consists of a conical funnel, which is inserted in a cylinder. In the latter the precipitating liquid is introduced from below and rises upwards therein, then flows over the funnel into the latter edge of the conical and again assumes a downwardly directed motion, to pass out finally at the lower aperture of the funnel. 20.

@tube T (Figure 1),

As the conical funnel' does not" extend right into the cylinder but ends about 5 to 8 centimeters below its upper edge, the fibres first traverse a rather long layer of very slowly moving precipitating liquid, which serves for the careful drawing out of the fibres.

It has. now been found that it is also possible to spin if the precipitating liquid is allowed to flow in the opposite direction in the conical funnel, that is to say, upwards. This is attained by connecting at or a short.

distance below the lower end of the cone,,

where the same merges into the cylindrical a side tube, and introducing the precipitating liquid through this. In this case the current of liquid divides, so that part of it flows upwar sthrough the cone in the opposite direction to the fibre, while another part flows downwards through the ipe 1*, that is, in the same direction as the fi re.

r'rocesses are already known in which the flowing of the precipitating liquid is likewise in the direction opposite to that of the fibres. In such cases however there is only one direction of flow in the spinning processes, whereas in the case of the present process both a counter-current and also a flow in thesamedirection take place in "one and he same piece of spinning apparatus. a

.The importance of this flow in the same direction in the lower part should not be underestimated as it is just here that the most rapid flowing of the precipitating ing liquid admitted from below,

742,699, andinfiermany November 5, 1923.

liquid occurs. Thus the fibre finds there no excessive friction, on the contrary it is drawnby the strong current flowing in the same direction, and the pull of the winding apparatus is thereby assisted, so that in this way the fibre is wound up on to the latter with a tension which is not too great.

In the drawing three pieces of apparatus for carrying out the new process are illustrated.

Figure 1 shows spinning apparatus with a cylindrical ning cone,

FigureQ a oonically shaped piece of apparatus without a jacket, and

Figure 3 a cylindrical piece of'apparatus with a short conical addition at the bottom.

For the carrying out of the process, water is admitted through'the pipe at, which is connected to the cone 0 in the neighborhood of the union of the pipe 1', the outlets of the-pipes 1- and 8 being closed. When the whole apparatus is filled with water the closure cover with the spinning nozzle plate 6 is put on, and the pipe 1" is then opened. Then the c ock is opened which lets the spinning solution pass through the nozzle plate. No flow of the water takes place at first through the funnel, that is, towards or against the descending fibres. The fibres can accordingly, descend without meeting with any resistance. -When the fibres come to thejunction point of the tube a they find there only themotion of the water toward the outlet of 1', so from this oint onwards they are drawn along .wit it.

jacket and an internal spin- They are then passed on to the winding- "mechanism, and a beginning can now be made with the counter-current by ,opening the closure of 8 also. The admission of wa-' ter is then regulated by a in such a way that so much water flows out of s as is found -by experience to be necessary for good spinning. I v

The cylindrical upper part of the spinning apparatus is made so long that the drawing out of the fibres proceeds mainly therein. Now the precipitating liquid in this part takes up much ammonia from the fibre passing through it. It would soon become unusable. for the precipitating or stiffening of the fibres if it were not constantly being renewed from the precipitatby meanl of which a condition of equilibrium suitable for good spinning is roduced.

Instead of letting t e precipitating liquid flow away through the pipe 8 is may be allowed to flow away through a pipe union of at th upper end of the spinning appa ratus, for the movement of the precipitating liquid in the upper cylindrical part of the apparatus is so small that it opposes no resistance at all to the passages of the fibre. In this case of course the renewal of the precipitating liquid in the'cylindrical part is somewhat quicker, which however causes no sort of harm. At most the hardeningof the fibres takes place somewhat more quickly. Here again, however, as in the first part,'there are two different flows present, one very slow and uniform in the cylindrical part, and one continuously varying with the cross-sectional area of the conical funnel in the latter.

Now if the discharge takes place from the pipe d, the apparatus can assume the simpler form according to Figure 2. Here the funnel 0 is connected directly to the cylindrical piece f and is in one piece therewith. w

It was found that it is possibl to work Without the conical funnel in the interior of the cylinder and without giving the spinning vessel the form of the said funnel, so that in this way the apparatus, as Figure 3 shows, consists only of a cylinder which is closed in a fluidtight manner at the top by means of a 'cover. The cover I) carries the nozzle plate, while the lower end is closed by a cap, which carries in the middle a short tubulure 1- to which the discharge pipe is secured by 'means of rubber tubing. Furthermore a second short tubulure s is applied to the bottom of the cap, through which the precipitating liquid enters In order that at the beginning of the spinning the descending fibres may not remain lying on the bottom of the cap but may pass out through the pipe r it is preferiible to make the bottom somewhat conica Thus the flow of the precipitating liquid is not in this case slow at the beginning and becoming slower later on, but a flow always remaining unformly slow in its passage through the cylinder. Instead of introducing the precipitating liquid through the pipe 8, it would be possible, as in the case of Figures 1 and 2 to attach to the pip 1' a side} pipe, and tating liquid enter there.

' at we claim is:

of so directing the fiow 0 liquid that it is countercurrent to the mo-.

to let the precipi- 1. In the process of spinning artificial silk by the stretch spinnintg process, the step the precipitating tion of the fibre until it ispartially hardened and cocurrent to the motion of the fibre after the fibre has been partially hardened.

2. In the silk by the stretch spinning process, the step of so directing the flow of the precipitating liquid that it is slowly countercurrent to the motion of the fibre until it is partially hardened and rapidly cocurrent-to the motion of the fibre after the fibre has been partially hardened.

3. In apparatus for spinning artificial silk by the stretch spinning method, a spinning rose for admission of the material to be spun situated near the top of a treating vessel, means for the admission of the precipitating liquid, means for discharging precipitating liquid and for removing the fibre being spun from the treatingvessel located below the inlet for the precipitating liquid, and other means for simultaneously discharging precipitating liquid located above the inlet for the precipitating li, uid.

4. In apparatus for spinning arti cial silk by the stretch spinning method, a spinning rose located near the top of a funnel shaped treating vessel, an inlet for precipitating liquid located at a cross section of the funnel of relatively small area, an outlet for the fibres being spun below the inlet for the precipitating liquid, and outlets for simultaneously discharging precipitatingliquid near the bottom and top of the treating vessel. 5. In" apparatus for spinning artificial silk, a treating vessel provided with a spinning rose for the admission of the material to be spun located near its top, said treating vessel comprising an upper portion of relatively large cross-section, a tapered intervening portion and a lower portion of relatively small cross-section, an inlet for precipitating liquid located near the upper part of said portion of smaller cross-section, an outlet for precipitating liquid located below the said inlet and in the portion of smaller cross-section, and another outlet for the simultaneous discharge of precipitating liquid located above said inlet and in the portion of larger cross section.

In testimony whereof, we have signed our names to this' specification.

EMIL ELSA'ESSER. AUGUST HARTNLAN N process of spinning artificial

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